1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2020 Linaro Ltd.
15 #include <linux/dma-mapping.h>
31  * and routing rules.  Each entry in these tables contains a 64-bit DMA
33  * A rule consists of a contiguous block of 32-bit values terminated with
42  * not all TX endpoints support filtering.  The first 64-bit entry in a
44  * the table.  The low-order bit (bit 0) in this bitmap represents a
47  * entry (i.e. a DMA address referring to a rule) for endpoint 0 in the
59  *                 ----------------------
61  *                 |--------------------|
62  * 1st endpoint    | 0x000123456789abc0 | DMA address for modem endpoint 2 rule
63  *                 |--------------------|
64  * 2nd endpoint    | 0x000123456789abf0 | DMA address for AP endpoint 5 rule
65  *                 |--------------------|
67  *                 |--------------------|
69  *                 |--------------------|
71  *                 ----------------------
80  *                 ----------------------
81  * 1st modem route | 0x0001234500001100 | DMA address for first route rule
82  *                 |--------------------|
83  * 2nd modem route | 0x0001234500001140 | DMA address for second route rule
84  *                 |--------------------|
86  *                 |--------------------|
87  * Last modem route| 0x0001234500002280 | DMA address for Nth route rule
88  *                 |--------------------|
89  * 1st AP route    | 0x0001234500001100 | DMA address for route rule (N+1)
90  *                 |--------------------|
91  * 2nd AP route    | 0x0001234500001140 | DMA address for next route rule
92  *                 |--------------------|
94  *                 |--------------------|
95  * Last AP route   | 0x0001234500002280 | DMA address for last route rule
96  *                 ----------------------
108 		(IPA_ROUTE_COUNT_MAX - IPA_ROUTE_MODEM_COUNT)
110 /* Filter or route rules consist of a set of 32-bit values followed by a
111  * 32-bit all-zero rule list terminator.  The "zero rule" is simply an
112  * all-zero rule followed by the list terminator.
123 	 * aligned on 128-byte byte boundaries.  The only rule address  in ipa_table_validate_build()
125 	 * of a coherent DMA allocation.  in ipa_table_validate_build()
129 	/* Filter and route tables contain DMA addresses that refer to  in ipa_table_validate_build()
138 	 * It is a 64-bit block of zeroed memory.  Code in ipa_table_init()  in ipa_table_validate_build()
155 	struct device *dev = &ipa->pdev->dev;  in ipa_table_valid_one()
156 	const struct ipa_mem *mem;  in ipa_table_valid_one()  local
161 			mem = hashed ? &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]  in ipa_table_valid_one()
162 				     : &ipa->mem[IPA_MEM_V6_ROUTE];  in ipa_table_valid_one()
164 			mem = hashed ? &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]  in ipa_table_valid_one()
165 				     : &ipa->mem[IPA_MEM_V4_ROUTE];  in ipa_table_valid_one()
169 			mem = hashed ? &ipa->mem[IPA_MEM_V6_FILTER_HASHED]  in ipa_table_valid_one()
170 				     : &ipa->mem[IPA_MEM_V6_FILTER];  in ipa_table_valid_one()
172 			mem = hashed ? &ipa->mem[IPA_MEM_V4_FILTER_HASHED]  in ipa_table_valid_one()
173 				     : &ipa->mem[IPA_MEM_V4_FILTER];  in ipa_table_valid_one()
177 	if (!ipa_cmd_table_valid(ipa, mem, route, ipv6, hashed))  in ipa_table_valid_one()
180 	/* mem->size >= size is sufficient, but we'll demand more */  in ipa_table_valid_one()
181 	if (mem->size == size)  in ipa_table_valid_one()
185 	if (hashed && !mem->size)  in ipa_table_valid_one()
190 		route ? "route" : "filter", mem->size, size);  in ipa_table_valid_one()
214 	struct device *dev = &ipa->pdev->dev;  in ipa_filter_map_valid()
255 	return ipa->table_addr + skip * sizeof(*ipa->table_virt);  in ipa_table_addr()
259 				u16 first, u16 count, const struct ipa_mem *mem)  in ipa_table_reset_add()  argument
261 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);  in ipa_table_reset_add()
267 	if (!mem->size)  in ipa_table_reset_add()
273 	offset = mem->offset + first * IPA_TABLE_ENTRY_SIZE;  in ipa_table_reset_add()
282  * for the IPv4 and IPv6 non-hashed and hashed filter tables.
285 ipa_filter_reset_table(struct ipa *ipa, const struct ipa_mem *mem, bool modem)  in ipa_filter_reset_table()  argument
287 	u32 ep_mask = ipa->filter_map;  in ipa_filter_reset_table()
292 	if (!mem->size)  in ipa_filter_reset_table()
297 		dev_err(&ipa->pdev->dev,  in ipa_filter_reset_table()
300 		return -EBUSY;  in ipa_filter_reset_table()
310 		endpoint = &ipa->endpoint[endpoint_id];  in ipa_filter_reset_table()
311 		if (endpoint->ee_id != ee_id)  in ipa_filter_reset_table()
314 		ipa_table_reset_add(trans, true, endpoint_id, 1, mem);  in ipa_filter_reset_table()
330 	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V4_FILTER], modem);  in ipa_filter_reset()
334 	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V4_FILTER_HASHED],  in ipa_filter_reset()
339 	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V6_FILTER], modem);  in ipa_filter_reset()
342 	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V6_FILTER_HASHED],  in ipa_filter_reset()
350  * won't exceed the per-transaction command limit.
360 		dev_err(&ipa->pdev->dev,  in ipa_route_reset()
363 		return -EBUSY;  in ipa_route_reset()
375 			    &ipa->mem[IPA_MEM_V4_ROUTE]);  in ipa_route_reset()
377 			    &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]);  in ipa_route_reset()
380 			    &ipa->mem[IPA_MEM_V6_ROUTE]);  in ipa_route_reset()
382 			    &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]);  in ipa_route_reset()
391 	struct device *dev = &ipa->pdev->dev;  in ipa_table_reset()
411 	u32 offset = ipa_reg_filt_rout_hash_flush_offset(ipa->version);  in ipa_table_hash_flush()
416 	if (ipa->version == IPA_VERSION_4_2)  in ipa_table_hash_flush()
421 		dev_err(&ipa->pdev->dev, "no transaction for hash flush\n");  in ipa_table_hash_flush()
422 		return -EBUSY;  in ipa_table_hash_flush()
437 			       const struct ipa_mem *mem,  in ipa_table_init_add()  argument
440 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);  in ipa_table_init_add()
449 	 * in the filter table.  The hashed and non-hashed filter table  in ipa_table_init_add()
454 		count = hweight32(ipa->filter_map);  in ipa_table_init_add()
455 		hash_count = hash_mem->size ? count : 0;  in ipa_table_init_add()
457 		count = mem->size / IPA_TABLE_ENTRY_SIZE;  in ipa_table_init_add()
458 		hash_count = hash_mem->size / IPA_TABLE_ENTRY_SIZE;  in ipa_table_init_add()
466 	ipa_cmd_table_init_add(trans, opcode, size, mem->offset, addr,  in ipa_table_init_add()
467 			       hash_size, hash_mem->offset, hash_addr);  in ipa_table_init_add()
476 		dev_err(&ipa->pdev->dev, "no transaction for table setup\n");  in ipa_table_setup()
477 		return -EBUSY;  in ipa_table_setup()
481 			   &ipa->mem[IPA_MEM_V4_ROUTE],  in ipa_table_setup()
482 			   &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]);  in ipa_table_setup()
485 			   &ipa->mem[IPA_MEM_V6_ROUTE],  in ipa_table_setup()
486 			   &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]);  in ipa_table_setup()
489 			   &ipa->mem[IPA_MEM_V4_FILTER],  in ipa_table_setup()
490 			   &ipa->mem[IPA_MEM_V4_FILTER_HASHED]);  in ipa_table_setup()
493 			   &ipa->mem[IPA_MEM_V6_FILTER],  in ipa_table_setup()
494 			   &ipa->mem[IPA_MEM_V6_FILTER_HASHED]);  in ipa_table_setup()
507  * ipa_filter_tuple_zero() - Zero an endpoint's hashed filter tuple
515 	u32 endpoint_id = endpoint->endpoint_id;  in ipa_filter_tuple_zero()
521 	val = ioread32(endpoint->ipa->reg_virt + offset);  in ipa_filter_tuple_zero()
523 	/* Zero all filter-related fields, preserving the rest */  in ipa_filter_tuple_zero()
526 	iowrite32(val, endpoint->ipa->reg_virt + offset);  in ipa_filter_tuple_zero()
532 	u32 ep_mask = ipa->filter_map;  in ipa_filter_config()
535 	if (ipa->version == IPA_VERSION_4_2)  in ipa_filter_config()
544 		endpoint = &ipa->endpoint[endpoint_id];  in ipa_filter_config()
545 		if (endpoint->ee_id == ee_id)  in ipa_filter_config()
558 		route_id <= IPA_ROUTE_MODEM_MIN + IPA_ROUTE_MODEM_COUNT - 1;  in ipa_route_id_modem()
562  * ipa_route_tuple_zero() - Zero a hashed route table entry tuple
573 	val = ioread32(ipa->reg_virt + offset);  in ipa_route_tuple_zero()
575 	/* Zero all route-related fields, preserving the rest */  in ipa_route_tuple_zero()
578 	iowrite32(val, ipa->reg_virt + offset);  in ipa_route_tuple_zero()
586 	if (ipa->version == IPA_VERSION_4_2)  in ipa_route_config()
616  * Initialize a coherent DMA allocation containing initialized filter and
623  * entries are 64 bits wide, and (other than the bitmap) contain the DMA
628  * Each entry in a route table is the DMA address of a routing rule.  For
629  * routing there is also a 64-bit "zero rule" that means no routing, and
634  * aligned on a 128 byte boundary.  The coherent DMA buffer we allocate here
636  * allocated space.  In ipa_table_init() we verify the minimum DMA allocation
639  *	     +-------------------+
640  *	 --> |     zero rule     |
641  *	/    |-------------------|
643  *	|\   |-------------------|
644  *	| ---- zero rule address | \
645  *	|\   |-------------------|  |
646  *	| ---- zero rule address |  |	IPA_FILTER_COUNT_MAX
647  *	|    |-------------------|   >	or IPA_ROUTE_COUNT_MAX,
649  *	 \   |-------------------|  |
650  *	  ---- zero rule address | /
651  *	     +-------------------+
656 	struct device *dev = &ipa->pdev->dev;  in ipa_table_init()
667 		return -ENOMEM;  in ipa_table_init()
669 	ipa->table_virt = virt;  in ipa_table_init()
670 	ipa->table_addr = addr;  in ipa_table_init()
680 	*virt++ = cpu_to_le64((u64)ipa->filter_map << 1);  in ipa_table_init()
682 	/* All the rest contain the DMA address of the zero rule */  in ipa_table_init()
684 	while (count--)  in ipa_table_init()
693 	struct device *dev = &ipa->pdev->dev;  in ipa_table_exit()
698 	dma_free_coherent(dev, size, ipa->table_virt, ipa->table_addr);  in ipa_table_exit()
699 	ipa->table_addr = 0;  in ipa_table_exit()
700 	ipa->table_virt = NULL;  in ipa_table_exit()